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package org.hisp.dhis.rules.functions;

/*
 * Copyright (c) 2004-2018, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import org.hisp.dhis.rules.RuleExpression;
import org.hisp.dhis.rules.RuleVariableValue;
import org.hisp.dhis.rules.parser.expression.CommonExpressionVisitor;
import org.hisp.dhis.rules.parser.expression.function.ScalarFunctionToEvaluate;

import java.util.List;

import static org.hisp.dhis.parser.expression.antlr.ExpressionParser.ExprContext;

/**
 * @author Zubair Asghar.
 * 
 * Counts the number of values that is zero or positive entered for the source field in the argument.
 * The source field parameter is the name of one of the defined source fields in the program.
 */
public class RuleFunctionCountIfZeroPos
    extends ScalarFunctionToEvaluate
{
    private boolean isZeroPos( String input )
    {
        Double value;

        try
        {
            value = Double.parseDouble( input );
        }
        catch ( NumberFormatException e )
        {
            throw new IllegalArgumentException( "Invalid number format" );
        }

        return value >= 0;
    }

    @Override
    public Object evaluate( ExprContext ctx, CommonExpressionVisitor visitor )
    {
        RuleVariableValue value = visitor.getValueMap().get( RuleExpression.getProgramRuleVariable( ctx ) );

        if ( value != null )
        {
            List candidates = value.candidates();

            Integer count = 0;
            for ( String string : candidates )
            {
                    if ( isZeroPos( string ) )
                    {
                            count++;
                    }
            }

//                        Integer count = candidates.stream().filter( this::isZeroPos ).collect( Collectors.toList() ).size();

            return String.valueOf( count );
        }
        else
        {
            return "0";
        }
    }

    @Override
    public Object getDescription( ExprContext ctx, CommonExpressionVisitor visitor )
    {
        getProgramArgType( ctx ).getDescription( ctx, visitor );

        return CommonExpressionVisitor.DEFAULT_DOUBLE_VALUE;
    }
}